Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

12.1k

Companies

579

Updated

10.10.2026

12.1k Questions 579 Companies10.10.2026

PLTCHK

"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"

_The_TaNk_

"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"

ChrisSenior SWE, LinkedIn

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord

"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

ShrutiData Engineer, Salesforce

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

midnightramen

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

BiancaFrontend Eng, Figma

"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa

"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."

PLTCHK

_The_TaNk_

ChrisSenior SWE, LinkedIn

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

ShrutiData Engineer, Salesforce

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

midnightramen

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

BiancaFrontend Eng, Figma

"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa

"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."

Showing 20 results

Upstart

Medium

Data Scientist

Find Minimum Path Sum in Integer Triangle

Scenario Tech interview round 1 – dynamic programming challenge Question Given a triangle of integers, find the minimum path sum from top to bottom. A...

Find longest segment with dominant ends

Question Given an integer array nums, find and return the length of the longest contiguous subarray such that the first and last elements of the subar...

Compute balances and array queries

Question Given a list of transactions where each transaction has a userId and an amount (positive for credit, negative for debit), compute the final b...

Shortest Talent-Covering Team Starting At Each Index

There are n students in a line. Each student has exactly one talent represented by an integer from 1 to talentsCount. A valid team is a contiguous sub...

Machine Learning Engineer

Design an LLM Chatbot: Training Data, Reward Design and Deployment Considerations

Design a chatbot built on a large language model. Walk through the whole lifecycle, and explain three areas in depth: how you would build the training...

ML System DesignFine-Tuning & Alignment TechniquesReinforcement Learning

Apply GenAI to Business Messaging

Product Strategy Prompt: Apply GenAI to Enterprise Business Messaging Explain what generative AI is and how you would apply it to an enterprise busine...

Product Design & Strategy

Identify Number Pairs Adding to Target in Array

Scenario Coding round to identify all number pairs that add up to a target in an array containing duplicates. Question Given an integer array (may con...

Define Success Metrics for Euro-Chat Customer-Service Chatbot

Success Metrics for the Euro-Chat Customer-Service Chatbot An e-commerce company deploys a customer-service chatbot called euro-chat to handle B2C sup...

Analytics & Experimentation

Design a meeting scheduler with cancellations

Design a meeting scheduler with cancellations System Design: Meeting Scheduling Platform (Onsite) Context Design a multi-tenant meeting scheduling sys...

System DesignSystem Design FundamentalsAPI Design

Connect next pointers for each tree level

You are given the root of a binary tree where each node has fields left, right, and next (initially null). For every node, set its next pointer to the...

Data Scientist Locked

Define metrics for new market expansion success

DoorDash new-market expansion analytics prompt covering marketplace health metrics, demand and supply diagnostics, guardrails, 6-month evaluation plan...

Analytics & ExperimentationMetrics & KPIsGrowth & Monetization

Machine Learning Engineer

Implement simulation-based portfolio optimizer in Python

Implement simulation-based portfolio optimizer in Python Given a pandas DataFrame 'returns' of daily asset returns (index: dates; columns: tickers) an...

Data Manipulation (SQL/Python)Pandas & Python DataProbability

Design analytics for a new-market launch

DoorDash New-City Launch: Metrics, Guardrails, and Causal Rollout Design Task Define success metrics and guardrails for three phases of a new-city lau...

Analytics & ExperimentationMetrics & KPIsExperiment Design (A/B Testing)

Implement iterators and write tests in Java

Implement iterators and write tests in Java In Java, write everything from scratch (no IDE scaffolding): 1) Define a generic Iterator<T> interface wit...

Coding & AlgorithmsProgramming LanguagesLow-Level Design (OOP)

Analytics Engineer Locked

Design and evaluate an ads ranking algorithm

This question evaluates a candidate's proficiency in designing and evaluating production-scale ads ranking systems within Machine Learning, covering r...

Machine LearningRanking ModelsCTR Prediction & Ads ML

Count clusters covered by dashers

Count clusters covered by dashers You are given two m×n binary matrices of equal size: D for dasher availability and U for user presence. A cell value...

Coding & AlgorithmsGrids & Matrices

Compute reservation diff for largest member

Given copies(copy_id, reserved_by_member_id) and members(member_id, referred_by_member_id), find the member with the largest member_id. Return a singl...

Data Manipulation (SQL/Python)

Implement decay simulation and trailing-zero counting

Implement the following in Python: 1) Radioactive decay simulation: Half-life is 1 day. Write a simulation function that takes: - input: integer m ...

Identify and prevent code-breaking inputs

Identify and prevent code-breaking inputs Identify inputs and scenarios that could break your implementation and explain how you would prevent them. C...

Coding & AlgorithmsTesting & Quality

Machine Learning Engineer Locked

Design a product-feed recommendation system

This question evaluates a candidate's competency in end-to-end machine learning system design for recommendation engines within the ML System Design d...

ML System Design

98 people solved

Oct 15, 2025

Tech Interview Questions

Find Minimum Path Sum in Integer Triangle

Find longest segment with dominant ends

Compute balances and array queries

Shortest Talent-Covering Team Starting At Each Index

Design an LLM Chatbot: Training Data, Reward Design and Deployment Considerations

Apply GenAI to Business Messaging

Identify Number Pairs Adding to Target in Array

Define Success Metrics for Euro-Chat Customer-Service Chatbot

Design a meeting scheduler with cancellations

Connect next pointers for each tree level

Define metrics for new market expansion success

Implement simulation-based portfolio optimizer in Python

Design analytics for a new-market launch

Implement iterators and write tests in Java

Design and evaluate an ads ranking algorithm

Count clusters covered by dashers

Compute reservation diff for largest member

Implement decay simulation and trailing-zero counting

Identify and prevent code-breaking inputs

Design a product-feed recommendation system

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Blind 75

ML System Design

System Design Interview